//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03

// <unordered_map>

// template <class Key, class T, class Hash = hash<Key>, class Pred = equal_to<Key>,
//           class Alloc = allocator<pair<const Key, T>>>
// class unordered_map

// unordered_map(initializer_list<value_type> il, size_type n,
//               const hasher& hf, const key_equal& eql, const allocator_type& a);

#include <unordered_map>
#include <string>
#include <cassert>
#include <cfloat>
#include <cmath>
#include <cstddef>

#include "test_macros.h"
#include "../../../test_compare.h"
#include "../../../test_hash.h"
#include "test_allocator.h"
#include "min_allocator.h"

int main(int, char**) {
  {
    typedef std::unordered_map<int,
                               std::string,
                               test_hash<int>,
                               test_equal_to<int>,
                               test_allocator<std::pair<const int, std::string> > >
        C;
    typedef std::pair<int, std::string> P;
    C c(
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        },
        7,
        test_hash<int>(8),
        test_equal_to<int>(9),
        test_allocator<std::pair<const int, std::string> >(10));
    LIBCPP_ASSERT(c.bucket_count() == 7);
    assert(c.size() == 4);
    assert(c.at(1) == "one");
    assert(c.at(2) == "two");
    assert(c.at(3) == "three");
    assert(c.at(4) == "four");
    assert(c.hash_function() == test_hash<int>(8));
    assert(c.key_eq() == test_equal_to<int>(9));
    assert(c.get_allocator() == (test_allocator<std::pair<const int, std::string> >(10)));
    assert(!c.empty());
    assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
    assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
    assert(std::fabs(c.load_factor() - (float)c.size() / c.bucket_count()) < FLT_EPSILON);
    assert(c.max_load_factor() == 1);
  }
  {
    typedef std::unordered_map<int,
                               std::string,
                               test_hash<int>,
                               test_equal_to<int>,
                               min_allocator<std::pair<const int, std::string> > >
        C;
    typedef std::pair<int, std::string> P;
    C c(
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        },
        7,
        test_hash<int>(8),
        test_equal_to<int>(9),
        min_allocator<std::pair<const int, std::string> >());
    LIBCPP_ASSERT(c.bucket_count() == 7);
    assert(c.size() == 4);
    assert(c.at(1) == "one");
    assert(c.at(2) == "two");
    assert(c.at(3) == "three");
    assert(c.at(4) == "four");
    assert(c.hash_function() == test_hash<int>(8));
    assert(c.key_eq() == test_equal_to<int>(9));
    assert(c.get_allocator() == (min_allocator<std::pair<const int, std::string> >()));
    assert(!c.empty());
    assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
    assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
    assert(std::fabs(c.load_factor() - (float)c.size() / c.bucket_count()) < FLT_EPSILON);
    assert(c.max_load_factor() == 1);
  }
  {
    typedef explicit_allocator<std::pair<const int, std::string>> A;
    typedef std::unordered_map<int, std::string, test_hash<int>, test_equal_to<int>, A > C;
    typedef std::pair<int, std::string> P;
    C c(
        {
            P(1, "one"),
            P(2, "two"),
            P(3, "three"),
            P(4, "four"),
            P(1, "four"),
            P(2, "four"),
        },
        7,
        test_hash<int>(8),
        test_equal_to<int>(9),
        A{});
    LIBCPP_ASSERT(c.bucket_count() == 7);
    assert(c.size() == 4);
    assert(c.at(1) == "one");
    assert(c.at(2) == "two");
    assert(c.at(3) == "three");
    assert(c.at(4) == "four");
    assert(c.hash_function() == test_hash<int>(8));
    assert(c.key_eq() == test_equal_to<int>(9));
    assert(c.get_allocator() == A{});
    assert(!c.empty());
    assert(static_cast<std::size_t>(std::distance(c.begin(), c.end())) == c.size());
    assert(static_cast<std::size_t>(std::distance(c.cbegin(), c.cend())) == c.size());
    assert(std::fabs(c.load_factor() - (float)c.size() / c.bucket_count()) < FLT_EPSILON);
    assert(c.max_load_factor() == 1);
  }

  return 0;
}
